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Same Space: If you are using transmitters in the same space, the most number of channels that will work
simultaneously is six wide band channels at 150 MHz. With all of the transmitters off, listen for interfer-
ence on all the wide band channels via the headphone jack. Using the channel frequency chart on page 21,
eliminate any channels that have noticeable interference. Now choose the channels with the widest channel
spacing. It is recommended that adjacent channels be spaced at least 300 KHz. If there is no interference the
following channels are recommended: 1, 2, 3, 4, 5, and 6 (wide band).
Distributed Spacing: If you are using transmitters that are spread out over space, you can achieve more
simultaneous broadcast channels. However, it is critical that your receiver(s) be located as close to its trans-
mitter as possible. You can use adjacent channels (see channel frequency chart on page 21) in this case as
long as the adjacent channel transmitter is at least 50% further away from the receiver as its transmitter.
Channel Select Mode
The Listen Button on your receiver has been programmed from the factory for Channel Select Mode. This
mode is especially useful for applications where users are required to select between active channels (such
as language interpretation or multiple classrooms), and you don’t want them to have to go through all avail-
able channels to find the appropriate channel. In this mode the button can be programmed to increment
only through the desired active channels in your facility and lock out all the other unused channels.
In this mode when the Listen Button is pressed the unit will increment through the channel list to the next
programmed channel. For example if there are three channels programmed (English, Spanish and Ger-
man) and the unit is on the English and the button is pressed the unit will switch to Spanish. If the button is
pressed again the unit will switch to German and an additional press will take the unit back to English again.
There are two modes to customize the channel list for the Listen Button. The two modes are Automatic
Channel Selection and Manual Channel Selection. These modes can be programmed using the unit or via
the IDSP Software Suite.
Your Listen receiver has been shipped to you with the Automatic Channel Selection, Auto 2 (channels 1 and
2) enabled for 150MHz.
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